Unfortunately no. All max raids battle Pokemon's stats are decided 3 days before. The only way to increase your chances is to join other peoples raids. However that comes with a reduced chance at catching the Pokemon at the end of the raid.
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Anonymous
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Anonymous
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For GMax pokémon, is there any way to at least increase the chances of having a hidden ability. such as saving before facing it, and soft reset if it doesn't have the hidden ability?